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  4. Which one of the following is an example of Hell-Volhard-Zelinsky reaction?

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Q. Which one of the following is an example of Hell-Volhard-Zelinsky reaction?

AMUAMU 2012Aldehydes Ketones and Carboxylic Acids

Solution:

When aliphatic carboxylic acids react with bromine in presence of red phosphorus give $\alpha$-halogenated acids. This reaction is known as Hell-Volhard-Zelinsky reaction.
$R_2CHCOOH \xrightarrow[(ii)H_2O]{(i)Br_2/Red \,P} R_2 - \underset{\overset{|}{Br}}{C} - COOH$